The Massachusetts Gambling Impact Cohort (MAGIC) is a prospective study of gambling and problem gambling conducted in Massachusetts from September 2013 to September 2019. Multi-modal recruitment was utilized to recruit a statewide sample of 3,139 adults, 18 and older, with the sample over-selected for individuals at higher risk of future problem gambling. The cohort was assessed five times over a six-year period with the vast majority of assessments being self-administered online. The assessment collected comprehensive information on gambling-related behavior, attitudes, motivations, context, fallacies; problem gambling; physical health; mental health; substance use and abuse; social functioning; personality; and demographics.

MAGIC had four primary research goals:
1. To monitor changes in gambling and problem gambling over time within the cohort that might identify impacts of Massachusetts casino introduction (Plainridge Park Casino in 2016; MGM Springfield in 2018; Encore Boston Harbor in 2019).
2. To determine the stability and course of problem, at-risk, and recreational gambling within the cohort.
3. To identify predictors of problem gambling onset, continuation, remission, and relapse.
4. To use the findings from the above research to provide recommendations to optimize the prevention and treatment of problem gambling in Massachusetts.